G.f. A(x) satisfies A(x) = 1 + x*A(x)*A(x^2)^2.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =10a(6) =19a(7) =40a(8) =77a(9) =155a(10) =306a(11) =610a(12) =1207a(13) =2400a(14) =4760a(15) =9456a(16) =18765a(17) =37257a(18) =73955a(19) =146813a(20) =291434a(21) =578524a(22) =1148434a(23) =2279720a(24) =4525487a(25) =8983421a(26) =17832976a(27) =35399824a(28) =70271944a(29) =139495472